Component Made of Metallic Composite Material and Method for the Manufacture of the Component by Hot Forming

Patent metadata

Field	Value
Publication number	US-2018304583-A1
Application number	US-201615769917-A
Country	US
Kind code	A1
Filing date	Oct 31, 2016
Priority date	Oct 30, 2015
Publication date	Oct 25, 2018
Grant date	—

Abstract

A component made of metallic composite material having high corrosion resistance and scale resistance. The metallic composite material contains as a core material an uncoated hardenable steel on which surface a corrosion resistance and scaling resistance layer is provided using heat resistant stainless steel, and has a yield strength Rp 0,2 of at least 1000 MPa and a tensile strength R m of at least 1500 MPa for the core material and a critical scaling resistance temperature in air for the layer material is at least 850° C.

First claim

1 . A component made of a metallic composite material having high corrosion resistance and scale resistance, wherein the metallic composite material comprises as a core material an uncoated hardenable steel on which surface a corrosion resistance and scaling resistance layer is provided using heat resistant stainless steel, and has a yield strength Rp 0,2 of at least 1000 MPa and a tensile strength R m of at least 1500 MPa for the core material and a critical scaling resistance temperature in air for the layer material is at least 850° C.

2 . The component according to claim 1 , wherein the chemical composition of the core material is by mass % up to 0.48% C, up to 0.4% N, up to 18% Cr, preferably 10.5-18% Cr, up to 8% Ni, up to 18% Mn, up to 3.0% Mo, up to 1.0% Si, up to 0.65% Cu, up to 0.005 B, the remainder being Fe and inevitable impurities.

3 . The component according to claim 1 , wherein the layer material is austenitic heat resistant stainless steel comprising by mass % 18-25% Cr, 10-19% Ni, Mn≥0.5% and Si≥0.4 %.

4. The component according to the claim 1 , wherein the layer material is ferritic heat resistant stainless steel comprising by mass % 13-18% Cr, Mn≥0.5%, Si≥1.0% and C≤0.1%.

5 . The component according to claim 1 , wherein the layer material is in the shape of a hot rolled strip or a hot rolled plate having a thickness at most 55 mm on a slab with a thickness of 220 mm, and the mutual thickness ratio between the layer material and the core material is at most 50% of the total thickness.

6 . The component according to claim 1 , wherein the layer material is in the shape of a cold rolled strip or a hot rolled plate having a thickness at most 2.5 mm, and the mutual thickness ratio between the layer material and the core material is at most 3.2%.

7 . The component according to claim 1 , wherein the mutual ratio of the thermal conductivity between the layer material and the core material is at most 2.

8 . A method for the manufacture of a component made of a metallic composite material having high corrosion resistance and scale resistance, comprising: welding a core material of uncovered hardenable steel and a layer material of heat resistant stainless steel together in order to produce a metallic composite material, wherein the layer material covers outer surfaces of the core material,
heat treating the composite material at the austenization temperature for at most 5 minutes, hot forming the heat treated composite material in a hot forming tool to have a desired shape of the component and cooling the hot formed component to the room temperature.

9 . The method according to claim 8 , wherein welding is carried out by laser welding.

10 . The method according to claim 8 , wherein welding is carried out by keyhole welding.

11 . The method according to claim 8 , wherein hot forming is carried out in an atmosphere comprising at least one shielding gas.

12 . The method according to claim 11 , wherein nitrogen is used as the shielding gas and a top part of the component has a nitride hardened surface with high wear resistance.

13 . The method according to claim 8 , wherein the core material for the composite material of the component is made of steel having a chemical composition comprising by mass % up to 0.48% C, up to 0.4% N, up to 18% Cr, preferably 10.5-18% Cr, up to 8% Ni, up to 18% Mn, up to 3.0% Mo, up to 1.0% Si, up to 0.65% Cu, the remainder being Fe and inevitable impurities.

14 . The method according to claim 8 , wherein the layer material for the composite material of the component is made of austenitic heat resistant stainless steel comprising by mass % 18-25% Cr, 10-19% Ni, Mn≥0.5% and Si≥0.4%.

15 . The method according to claim 8 , wherein the layer material for the composite material of the component is made of ferritic heat resistant stainless steel comprising by mass % 13-18% Cr, Mn≥0.5%, Si≥1.0% and C≤0.1%.

16 . The method according to claim 8 , wherein a heating rate during the hot forming process of the composite material is at least 50 K/s.

17 . The method according to claim 8 , wherein the composite material is removed from the hot forming tool during the cool-down process when the martensitic start temperature (M s ) of the layer material is reached.

18 . The method according to claim 8 , wherein the connection of the layer material to the core material is achieved by preconditioning by electrobrightening with an electrolytic solution comprising a 96% sulfuric acid and 85% orthophosphoric acid.

Assignees

• Outokumpu Oy

Inventors

• Brückner Gabriele
• Fröhlich Thomas
• Nentwig Thomas
• Skrlec Jasminko
• Lindner Stefan

Classifications

• C22C38/42

  with copper · CPC title

• B32B2307/714

  Inert, i.e. inert to chemical degradation, corrosion · CPC title

• C22C38/58

  with more than 1.5% by weight of manganese · CPC title

• C22C38/18

  containing chromium · CPC title

• B32B15/011 Primary

  all layers being formed of iron alloys or steels · CPC title